I am using player.setVelocity(player.getLocation().getDirection().multiply(Main.instance.getConfig().getDouble("velocity_multiplier")).setY(Main.instance.getConfig().getInt("Y_axis"))); to set velocity to a player. It allows high configuration of movement via config, but the problem is that when you set it too high, Spigot blocks it. I do not want to enable:
server.properties: allow_flight.
So how can I avoid this? I bumped up the multiplier to 30 just for a test, and it would start to move you, glitch, and pull you back down. It also says that the player moved too quickly in console even from smaller amounts of velocity. I was thinking of making it gradually apply the velocity. When you jump, it applies the starting velocity and as you go it goes higher(Y_axis) and farther(velocity_multiplier), but I do not know how to do that.
Beyond code, you likely would be best situated to address your issue by allowing flight in the Spigot file and installing or developing an anti-cheat in the game. Spigot's flight protection works poorly with many plugins and does not successfully block many players who attempt to fly.
Best advice would be to look beyond a makeshift code solution and rather create your own anti-fly.